Pressure valve



Nov. 26, 1929; N. MERCUR 1,737,428

; PRESSURE VALVE Filed April 4, 1928 78 I I 9 4 f 4- WITNE5$E5 INVENTOR1- We 5 P3 W 1. mm

' 35 \IM'QW Patented Nov. 26, 1329 UNIT'D ric NATHAN L. MERC'UB, OlEMCKEESPORT, PENNSYLVANIA, ASSIGINOR TO 0. HOWARD HOOK, OF PITTSBURGH,PENNSYLVANIA r @RESSURE VALVE Application fliefl'iapril 4,

This invention relates to pressure regulating valves and more especiallyto a combination pressure regulating and pressure relief valve.

It is common practice today to employ a reducing or regulating valve forcontrolling the flow of fluid under pressure from one system to anotherand a second valve for relieving the pressure in either of the systemsin case it exceeds a predetermined limit.

It is the object of this invention generally stated to provide in asingle unit for regulating the flow of fluid from one system to anotherand for relieving the pressure in the second system in case it exceeds apredetermined limit.

Another object of the invention is to provide means in a valve of theabove described character for operating devices exterior to the valveitself.

Further objects of the invention will become apparent and a morecomplete understanding thereof will be had when the followingdescription is read in conjunction with the accompanying drawing whereinthe single figure illustrates a preferred embodiment of the invention.

In this form of the invention the valve comprises a main casing 1,having inlet and outlet ports as indicated by the arrows leadingrespectively into an inlet chamber 2 and out of an outlet chamber 3. Thecasing has a vertical bore 4 in which is seated a sleeve 5 which itselfhas a vertical bore '6 through which any fluid passing through thecasing must go, and in order to facilitate the flow of fluidtherethrough a fluting 8 is out around the outside of the sleeve 5 wherethe inlet chamber 2 connects with the vertical bore 4. The passagethrough the bore 6 is controlled by a vertically reciprocable valve 9,mounted upon a valve stem 11. The valve 9 has annular grooves 12disposed near its two ends to provide fluid seal contact with the sleeve5.

A diaphragm 13 extends across the top of the casing 1 and the end of thestem 11 1s fitted into a supporting member 14 mounted in the center ofthe diaphragm 13. A cap housing 15 is adapted to fit over the lower1928. Serial No. 267,231.

casing 1 and may be clamped thereto in any suitable manner to maintainthe diaphragm 13 in place. A coil spring 16 is disposed inslde of thecap 15 and adapted to bear upon the support member 14 to exert apressure on the center of the diaphragm 13. A disk 17 is fitted inthetop of the cap 15, and adapted to engage the upper end of the spring 16.In order to adjust the pressurein the spring 16 a set screw 18bearing'on the top of the disk 17 is disposed in thetop of the cap 15.Hence, the pressure that spring 16 exerts upon the diaphragm 13 can beregulated by movement of the adjusting screw 18.

An annular groove is provided in the valve stem support member 14 forreceiving the inner end of a regulating or control lever 19 which isinserted through an opening 20 in the cap 15. An upwardly extendingprojection 21 is provided on the exterior of the casing 15 to form afulcrum about which the lever 19 is pivoted.

In the base of the casing -1 is a. vertical bore 22 into which is fitteda sleeve 23 which itself has a verticalbore 24. At right angles to thebore 22 isan overflow or exhaust outlet 25 through which fluid releasedfrom the outlet chamber 3 may pass. Disposed inside of the bore 24 is asleeve valve 26 which has an annular fluted portion 27 which cooperateswith an annular-fluted portion 30 and openings in the sleeve 23. Fromthe lower portion of the valve stem 11 there extends a threaded stem 31which engages a cooperating threaded sleeve member 32 which has in itslower section a non-circular bore 33 adapted to be engaged by anon-circular adjusting member 34 which has an exterior noncircularportion 35. The sleeve member 32 is in turn disposed inside the sleevevalve 26 and a coil spring-36 is interposed between relief port Theoperation of the device is as follows:

The pressure in the main spring 16 is first adj usted. by the regulatingscrew 18 to exert the desired pressure upon the diaphragm 13, as forexample sufficient to maintain the valve 9 open until 10 pounds of fluidpressure is present in the outlet chamber. Assuming that there is nopressure at all on the outlet side of the valve, the spring 16 willdepress the diaphragm 13 and consequently the valve 9 so that a clearpassage is made from the inlet chamber 2 of the main valve through theopening in the sleeve 5, and thence through the outlet chamber 3 to theoutlet port. When suflicient fluid has passed into the system leadingfrom the outlet chamber 3 to build up a pressure slightly in excess of10 pounds, the diaphragm 13 will be forced upward against the spring 16until the valve 9 shuts off the lateral ports in the sleeve 5. In otherwords, the valve will move to the closed position shown in thedrawing.The lever 19 actuated by this movement of the main valve may be employedto shut ofi'the gas of a heating system or operate any desired controldevice or regulator.

It is often desired. to maintain the pressure in the system leading fromthe outlet side of the valve within a predetermined limit, and in orderto relieve the pressure in the outletsystem in case it. for any reasonrises above. the predeterminedvalue, the valve mechanism in the base ofthe outlet chamber is provided. Assuming the main valve 9 to be closedas shown in the drawing, an assuming that the pressure on the outletside or in the outlet chamber 3 is greater than that desired, forexample greater than 10 pounds, the diaphragm 13 will be forced upwarddepending in' distance upon the pressure in the outlet chamber. When ithas moved upwardly far enough valve sleeve 26- will raise the flutedlower portion 27- above the upper edge of the sleeve 23, whereupon fluidwill pass downward around the fluted skirt of the sleeve valve 26 andout the escape port 25. This drainage will continue until the pressurein the outlet chamber is reduced sufficiently to allow the spring 16 toforce the diaphragm 13 downward, far enough tomove the sleeve-valve 26to the closed position as illustrated in the drawing.

In case it is desired to maintain the pressure in the outlet system atsome otherlimit than 10 pounds, the adjusting member 34 may be actuatedto move the sleeve member 32 up or down on the threaded portion 31 ofthe stem 11. When the sleeve valve 26 is lowered greater pressure willbe required inside of the outlet chamber 3 to raise the sleeve valvesufficiently to allow the enclosed fluid to escape through the outletport as it will be necessary to distort the diaphragm .13 to a greaterextent 1 stem to which said to raise valve 26 to its pressure-releasingposition. It will also be readily seen that by raising the sleeve valve26 the release can be effected when a smaller pressure is present in theoutlet chamber.

According to the provisions of the patent statutes, I have explained theprinciple and mode of operation of my invention and have illustratedwhat I now consider to be its preferred embodiment. However, I desire tohave it understood that, within the scope of the appended claims theinvention may be practiced otherwise than as specifically described.

I elaim:

1. A fluid pressure regulator comprising a valve casing having an inletand an outlet chamber, an opening connecting said chambers, a sleevedisposed in said opening, a reciprocable valve fitted into said sleeve,a relief opening in said outlet chamber, a sleeve disposed in said lastnamed opening, a reciprocable valve fitted in-said last-named sleeve, avalve stem connectingsaid valves, a diaphragm connected to'and adaptedto move said valve stem, said diaphragm being adapted to be moved bypressure in the outlet chamben' 2. A fluid pressure regulator comprisinga valve casing having an inlet and an outlet chamber, an openingconnecting said chambers, a reciprocable valve disposed in said opening,a relief opening in said outlet chamber, a sleeve valve disposed in saidrelief open- .ing, a single valve stem for moving both a thread cut onthe lower end of said sleeve valve is connected, a .threaded memberengaging said sleeve valve threaded onto said valve stem, a springinterposed between a shoulder on said valve stem and said sleeve valvefor maintaining said sleeve valve in engagement with said valves,

threaded member, means disposed in the base of said casing for turningsaid threaded member to'adjust said sleeve valve.

3. A fluid pressure regulator comprising a valve casing having an inletand an outlet chamber, an opening connecting said chambers,a sleevedisposed in said opening, a reciprocable valve fitted in said sleeve, arelief opening in said outlet chamber, a sleeve disposed in said reliefopening, a sleeve valve 7 fitted in said sleeve, :1 single valve stem onwhich said first mentioned valve is mounted said stem having a threadcut on its lower end for attaching said sleeve valve thereto, a valveadjusting ,member engaging said sleeve valve provided with an insidethread for connecting said sleeve valve to said stem, an adjustingmember fitted in the base ofvsaid relief openin sleeve for adjustingsaid sleeve valve, a diap ragxm disposed to be moved b the pressure in te outlet chamber, to whic said valve stem is attached, a spring adaptedto bear upon said diaphragm, a threaded screw engaging the top end ofthe spring for adjusting the pressure therein to predetermine themovement of the diaphragm in response to the pressure in the outletchamber, and a lever Operably disposed to be actuated by said diaphragm.

In testimony whereof, I- sign my name.

NATHAN L. MERCUR.

